1797-BIC Intrinsically Safe Bus Isolator (Industrial-Grade Explosion Protection)

The 1797-BIC represents a mission-critical safety interface for control systems operating in explosive atmospheres. Engineered as a galvanic isolation barrier, this module enables safe communication between standard control networks and intrinsically safe FLEX Ex I/O modules deployed in hazardous zones. By limiting energy transfer to levels incapable of igniting flammable gases or combustible dust, the 1797-BIC protects personnel, assets, and production continuity in oil refineries, chemical plants, pharmaceutical facilities, and mining operations.

Designed for system integrators and plant engineers managing Class I Division 1, Zone 1, and Zone 2 installations, this isolator supports up to eight FLEX Ex modules per segment while maintaining full compliance with ATEX, IECEx, FM, and cULus standards. Its hot-swappable architecture and transparent integration with ControlLogix, CompactLogix, and SLC 500 platforms minimize commissioning time and operational disruption.

Whether you're retrofitting legacy systems for hazardous area compliance or designing greenfield installations with distributed I/O architectures, the 1797-BIC delivers certified protection without sacrificing system performance or diagnostic visibility.

Core Features & Benefits

✓ Multi-Module Isolation Capacity
Supports up to 8 FLEX Ex I/O modules per isolator, reducing hardware costs and panel space requirements compared to single-channel barriers while maintaining independent fault isolation for each module.

✓ Global Hazardous Area Certification
Certified to ATEX (Europe), IECEx (International), FM (North America), and cULus standards for [Ex ib] IIC applications in Zone 1, Zone 2, Class I Division 1, and Class I Division 2 environments—ensuring regulatory compliance across global installations.

✓ Galvanic Isolation Technology
Provides electrical separation per DIN EN 60079-11, preventing fault currents from hazardous areas from propagating to safe-area control systems while maintaining signal integrity across 500-meter distributed I/O networks.

→ Hot-Swappable Design
Enables module replacement during system operation without de-energizing the entire I/O segment, reducing mean time to repair (MTTR) and supporting predictive maintenance strategies in 24/7 production environments.

→ Transparent System Integration
Operates as a pass-through device requiring no special configuration in RSLogix or Studio 5000 software—existing ladder logic and I/O mapping remain unchanged during hazardous area upgrades.

→ Wide Operating Temperature Range
Functions reliably from -20°C to 70°C (-4°F to 158°F), accommodating outdoor installations, unheated enclosures, and process areas with elevated ambient temperatures.

Typical Application Scenarios

Upstream Oil & Gas Production
Scenario: Offshore platform wellhead monitoring with pressure, temperature, and flow transmitters in Zone 1 classified areas.
Pain Point Solved: Eliminates costly explosion-proof junction boxes while enabling centralized I/O diagnostics from the control room.
Value Delivered: Reduces installation costs by 40% compared to traditional Zener barrier systems and simplifies troubleshooting with integrated LED status indicators.

Chemical Batch Processing
Scenario: Reactor vessel control with analog inputs for level, pH, and conductivity sensors in solvent handling areas.
Pain Point Solved: Provides certified isolation for 4-20mA loops without signal degradation or ground loop interference.
Value Delivered: Maintains ±0.1% measurement accuracy while meeting IEC 61511 SIL 2 functional safety requirements for emergency shutdown systems.

Pharmaceutical Solvent Recovery
Scenario: Distillation column automation in cleanroom-adjacent areas with flammable vapor concentrations.
Pain Point Solved: Enables GMP-compliant data logging and recipe management without compromising explosion protection.
Value Delivered: Supports FDA 21 CFR Part 11 audit trails through seamless integration with PlantPAx DCS platforms.

Underground Coal Mining
Scenario: Conveyor belt monitoring and ventilation control in methane-rich environments.
Pain Point Solved: Withstands shock, vibration, and humidity while maintaining intrinsic safety parameters under fault conditions.
Value Delivered: Achieves MSHA compliance with IP20-rated enclosures and conformal-coated PCBs for extended service life.

Technical Parameters & Selection Guide

Selection Criteria: Calculate total I/O point count and verify that entity parameters (Ci, Li) of connected field devices do not exceed isolator output limits (Co/Ca, Lo/La). For applications requiring more than 8 modules, deploy multiple 1797-BIC isolators with separate power supplies. Consult NFPA 70 Article 504 or IEC 60079-25 for cable routing and grounding requirements in your jurisdiction.

Extended Functions

Diagnostic Integration: The onboard green LED provides instant visual confirmation of power status, while the FLEX Ex modules themselves report individual channel faults to the controller via standard I/O health bits—enabling predictive maintenance through FactoryTalk Analytics or third-party SCADA platforms.

Redundant Power Options: When paired with 1797-PS2E redundant power supplies, the system achieves N+1 availability for critical safety instrumented functions (SIF) in SIL-rated applications, automatically switching to backup power without I/O interruption.

Custom Entity Parameter Matching: Engineering support available to calculate safe installation parameters for non-standard field devices, including smart transmitters with HART communication and legacy 2-wire sensors with high capacitance loads.

Delivery & Service Assurance

Lead Time: Stock items ship within 2-3 business days via DHL/FedEx with tracking. Custom-configured systems (pre-wired terminal blocks, tested assemblies) require 7-10 business days for quality assurance and documentation.

Warranty Coverage: 12-month manufacturer warranty against defects in materials and workmanship, with optional extended coverage available for mission-critical installations.

Technical Support: Access to certified automation engineers for application design review, entity parameter calculations, and troubleshooting assistance via email, phone, or remote desktop sessions.

Documentation Package: Each unit includes installation manual, entity parameter certificates, ATEX/IECEx declarations of conformity, and AutoCAD DWG files for panel layout integration.

Frequently Asked Questions

What is the maximum distance between the 1797-BIC isolator and field instruments in hazardous zones?
Cable length depends on the combined capacitance and inductance of the wiring and field device. For typical 4-20mA transmitters with Ci < 10µF and Li < 50µH, distances up to 1000 meters are achievable using shielded twisted-pair cable. Always verify entity parameters against isolator output limits (Co/Ca and Lo/La) before installation.

Can I use the 1797-BIC with non-Allen-Bradley intrinsically safe devices?
Yes, provided the field device entity parameters (Ui, Ii, Pi, Ci, Li) are compatible with the isolator's output limits. Third-party transmitters, solenoid valves, and sensors certified to IECEx or ATEX standards can be connected following proper entity parameter calculations per IEC 60079-25.

How do I configure the isolator in Studio 5000 or RSLogix software?
No configuration is required—the 1797-BIC operates as a transparent pass-through device. Simply add FLEX Ex I/O modules to your controller's I/O tree as you would in non-hazardous applications. The isolator automatically manages energy limiting without affecting tag addressing or ladder logic.

What certifications are required for installation in European ATEX Zone 1 areas?
The 1797-BIC carries ATEX marking II 3 G Ex ic IIC T4 Gc for Zone 2 (safe area side) and must be installed in a Zone 2 or non-hazardous location. Connected FLEX Ex modules must carry appropriate Zone 1 certifications (Ex ib IIC T4 Gb). Installation must comply with EN 60079-14 and local electrical codes.

Does the isolator support HART communication for smart transmitters?
Yes, when used with 1797-IExxH HART-enabled FLEX Ex analog input modules, the isolator passes HART digital signals transparently. HART configuration and diagnostics are performed through the FLEX Ex module using RSNetWorx or third-party HART configurators.

What maintenance intervals are recommended for hazardous area installations?
The 1797-BIC is maintenance-free under normal conditions. Quarterly visual inspections should verify LED status, terminal tightness (re-torque to 0.5 Nm), and absence of dust accumulation. Annual thermographic scans can detect loose connections before failure. Replace modules showing physical damage or erratic LED behavior immediately.

Ready to Secure Your Hazardous Area Control System?

Contact our application engineers today for entity parameter verification, system design review, or to request a formal quotation with delivery timelines. We provide complete documentation packages including installation drawings, certification matrices, and compliance checklists to accelerate your project approval process.

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